The gap between N-H is incredibly large
Not in star rating, but in actual playability
I'm almost sure BPM needs to be doubled. me too, but at the moment this song has 143bpmlemme describe this with theorical things
Also, I agree with baraatje, the gap between Normal and Hard is huge due to the SV of Hard and needs another diff inbetween.
Hard diff was very nice diff compared with Insane diff it's very effective and nice gap.
However, this hard playability almost same with insane (with fast SV, some Complex pattern, and many more)
at same time Normal has simpler pattern (basically has 1/2 and 1/1 pattern which it can be high gap between normal and hard)
at this problem there is no help by nerfing Hard diff or Increase density on normal diff, ummm maybe you can look this graphs
hard Speed and jump graph which average speed is 4.84 and average jump 3.03
normal speed and jump grpah which average speed is 2.94 and average jump 1.84
and this for insane graph
insane has more average speed and jump graph and it has very good gap with Hard diff
but at the moment when you compare the speed gap between Hard and normal, it looks like very far (especially from Jump graph)
How to fix this
i hope you made Advanced diff with some simple 1/4 pattern and more 1/2 pattern and some light jump to balance normal and hard gap, and there is no problem on mapset again, effective star rating -> 2.2 ~ 2.5
good luck with this and no kd since im already infiltrate this thread